4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ard Biesheuvel <ard.biesheu...@linaro.org>
commit 30b5ba5cf333cc650e474eaf2cc1ae91bc7cf89f upstream.
Implement a macro mov_q that can be used to move an immediate constant
into a 64-bit register, using between 2 and 4 movz/movk instructions
(depending on the operand)
Acked-by: Catalin Marinas <catalin.mari...@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
Signed-off-by: Will Deacon <will.dea...@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poul...@arm.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/arm64/include/asm/assembler.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -204,4 +204,24 @@ lr .req x30 // link register
.size __pi_##x, . - x; \
ENDPROC(x)
+ /*
+ * mov_q - move an immediate constant into a 64-bit register using
+ * between 2 and 4 movz/movk instructions (depending on the
+ * magnitude and sign of the operand)
+ */
+ .macro mov_q, reg, val
+ .if (((\val) >> 31) == 0 || ((\val) >> 31) == 0x1ffffffff)
+ movz \reg, :abs_g1_s:\val
+ .else
+ .if (((\val) >> 47) == 0 || ((\val) >> 47) == 0x1ffff)
+ movz \reg, :abs_g2_s:\val
+ .else
+ movz \reg, :abs_g3:\val
+ movk \reg, :abs_g2_nc:\val
+ .endif
+ movk \reg, :abs_g1_nc:\val
+ .endif
+ movk \reg, :abs_g0_nc:\val
+ .endm
+
#endif /* __ASM_ASSEMBLER_H */
